Yeah can't say I agree with most of the stuff here

How would one measure great? Who would be the judge? If there was some God that was the judge, that wouldn't make much sense. Something would have to give the mundane (i.e. ash) metaphysical properties, and I doubt that any of the Gods would do that for the Nonmen.
I still hold that its a physical translation, perhaps due to the tekne affects, but not involving Gods or metaphysics. Though, one could still say that the "greatest" (smartest, strongest, etc.) could have received "more" of whatever "it" is that the Inchoroi did to them. But here "great" is simply a byproduct of the drugs taken.